{"id":13807,"date":"2013-03-01T11:21:40","date_gmt":"2013-03-01T16:21:40","guid":{"rendered":"http:\/\/www.constructionspecifier.com\/?p=13807"},"modified":"2017-01-11T15:42:20","modified_gmt":"2017-01-11T20:42:20","slug":"a-question-of-exposure","status":"publish","type":"post","link":"https:\/\/www.constructionspecifier.com\/a-question-of-exposure\/","title":{"rendered":"A question of exposure"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-569 alignleft\" src=\"http:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2013\/08\/slaton.jpg\" alt=\"slaton\" width=\"100\" height=\"104\" \/> <img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-571 alignleft\" src=\"http:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2013\/08\/patterson.jpg\" alt=\"patterson\" width=\"100\" height=\"104\" \/> <span style=\"font-size: large;\"><strong><span style=\"color: #808080;\">FAILURES<\/span><\/strong><\/span><br \/>\n<strong>Deborah Slaton &amp; David S. Patterson, AIA<br \/>\n<\/strong>In winter, we become especially aware of the effects of exposure on everything around us. Cyclic wetting and drying, freezing and thawing, dramatic changes in temperature, wind, and cold all contribute to weathering and deterioration of the built environment\u2019s elements (and, sometimes, its occupants).<\/p>\n<p>The presence of repeated elements provides a unique opportunity to consider how exposure affects performance and durability. For example, limestone cladding panels on a shaded north-facing building wall may be covered with organic growth while those on a south-facing wall remain clean. Conversely, paint coatings on a west elevation can exhibit cracking associated with exposure to strong sunlight, while those on a shaded east elevation remain intact. Horizontal wood trim elements on which water can accumulate are subject to paint failure and other deterioration, while vertical wood trim elements are much less vulnerable to these types of distress.<\/p>\n<figure id=\"attachment_13820\" aria-describedby=\"caption-attachment-13820\" style=\"width: 800px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2013\/03\/failures-Photo-1-2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-13820 size-full\" src=\"http:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2013\/03\/failures-Photo-1-2.jpg\" alt=\"One concrete bench is much more deteriorated than its companions. Environmental conditions are generally similar for all benches, and comparison of existing conditions suggests this one was fabricated differently than the others, with insufficient concrete cover over the reinforcing steel. Photos courtesy Harry J. Hunderman, FAIA, WJE\" width=\"800\" height=\"287\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2013\/03\/failures-Photo-1-2.jpg 800w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2013\/03\/failures-Photo-1-2-300x108.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2013\/03\/failures-Photo-1-2-624x224.jpg 624w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><figcaption id=\"caption-attachment-13820\" class=\"wp-caption-text\"><span style=\"font-size: 10pt;\">One concrete bench is much more deteriorated than its companions. Environmental conditions are generally similar for all benches, and comparison of existing conditions suggests this one was fabricated differently than the others, with insufficient concrete cover over the reinforcing steel.<\/span><br \/> <em><span style=\"font-size: 8pt;\">Photos courtesy Harry J. Hunderman, FAIA, WJE<\/span><\/em><\/figcaption><\/figure>\n<p>Where built objects are apparently similar, exposure may be a key factor in how they weather differently. Similarly, differential weathering may indicate these objects are not as similar as they initially appear.<\/p>\n<p>Exposure is a key factor in the example illustrated below, though in a different sense. A series of concrete benches surrounding a seating area in a Midwestern park are equally subject to sun, heat, rain, wind, snow, cold, and de-icing salts on adjacent paving. Although individual benches have been damaged in isolated areas by vandalism or skateboards, most have survived intact through many seasons or have only been minimally affected by concrete deterioration. However, one bench is significantly deteriorated, with extensive spalling of concrete and exposed corroding steel reinforcing bars.<\/p>\n<p>In this example, all the benches experience similar environmental conditions. This suggests the deterioration of one bench among the others is related less to its overall exposure, and more to the apparent lack of sufficient concrete cover over the reinforcing steel. In other words, while all the benches look alike, an apparent problem in fabrication of the upper portion of one bench has left it more vulnerable to deterioration as water penetrates cracks in the concrete. The result is spalling of the concrete and corrosion of the reinforcing steel. Water penetration and concrete spalling has left more extensive areas of steel vulnerable to corrosion, further contributing to the concrete\u2019s ongoing deterioration.<\/p>\n<p><em>Deborah Slaton is an architectural conservator and principal with Wiss, Janney, Elstner Associates (WJE) in Northbrook, Illinois, specializing in historic preservation and materials conservation. She can be reached at <a href=\"mailto:dslaton@wje.com\" target=\"_blank\">dslaton@wje.com<\/a>.<\/em><\/p>\n<p><em>David S. Patterson, AIA, is an architect and senior principal with the Princeton, New Jersey, office of WJE, specializing in investigation and repair of the building envelope. He can be contacted at <a href=\"mailto:dpatterson@wje.com\" target=\"_blank\">dpatterson@wje.com<\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In winter, we become especially aware of the effects of exposure on everything around us. Cyclic wetting and drying, freezing and thawing, dramatic changes in temperature, wind, and cold all contribute to weathering and deterioration of the built environment\u2019s elements (and, sometimes, its occupants).<\/p>\n","protected":false},"author":10,"featured_media":13820,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9,179,183,237,24],"tags":[752,2294,2155,2119,1142],"class_list":["post-13807","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-columns","category-masterformat","category-03-00-00-concrete","category-03-10-00-concrete-forming-and-accessories","category-failures","tag-concrete","tag-concrete-spalling","tag-david-s-patterson","tag-deborah-slaton","tag-deterioration","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>A question of exposure - The Construction Specifier<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.constructionspecifier.com\/a-question-of-exposure\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A question of exposure - The Construction Specifier\" \/>\n<meta property=\"og:description\" content=\"In winter, we become especially aware of the effects of exposure on everything around us. 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